CN216447215U - Hydraulic control system of heading machine - Google Patents
Hydraulic control system of heading machine Download PDFInfo
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- CN216447215U CN216447215U CN202122506512.3U CN202122506512U CN216447215U CN 216447215 U CN216447215 U CN 216447215U CN 202122506512 U CN202122506512 U CN 202122506512U CN 216447215 U CN216447215 U CN 216447215U
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Abstract
The utility model discloses a hydraulic control system of a heading machine, which relates to the technical field of hydraulic control systems and comprises a pressure cylinder, a first reversing valve, an oil supply system and an oil return tank, wherein the inlet of the first reversing valve is connected with a high-pressure oil line, the outlet of the first reversing valve is respectively connected with a rod cavity, a rodless cavity and the oil return tank of the pressure cylinder, a low-pressure oil line is connected with the rodless cavity through a second oil line, a first switch valve used for controlling the communication and disconnection of the low-pressure oil line and the rodless cavity is arranged on the low-pressure oil line, the rodless cavity is connected with the oil return tank through a third oil line, a first two-way valve is arranged on the third oil line, and a second switch valve used for controlling the communication and disconnection of the low-pressure oil line and the rodless cavity is also arranged on a pipeline connected with the first two-way valve. The two low-pressure oil paths charge hydraulic oil into the rodless cavity to quickly supplement the oil to form fast forward, when one low-pressure oil path and one high-pressure oil path are adopted to charge the hydraulic oil into the rodless cavity to form stable working feed, when the high-pressure oil path is charged into the rod cavity, and the two paths of oil return of the rodless cavity form fast backward.
Description
Technical Field
The utility model relates to the technical field of hydraulic control systems, in particular to a hydraulic control system of a heading machine.
Background
The heading machine is the main equipment for producing the ball at present. The existing heading ball production process comprises the following steps: feeding, straightening, cutting, feeding into a die cavity and upsetting and forming, wherein in the upsetting and forming process, a pressure cylinder is generally adopted as main pressing power, but the conventional upsetting ball machine cannot realize fast forward, stable work forward, fast backward and other actions, so that the working efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a hydraulic control system of a heading machine, which aims to solve the problems in the prior art, enable a pressure cylinder to fast forward, stably work forward and fast backward and ensure the working efficiency.
In order to achieve the purpose, the utility model provides the following scheme:
the utility model provides a hydraulic control system of a heading machine, which comprises a pressure cylinder, a first reversing valve, an oil supply system and an oil return tank, wherein the pressure cylinder is provided with a rod cavity and a rodless cavity, the oil supply system is provided with a low-pressure oil way and a high-pressure oil way, the oil pressure of the high-pressure oil way is higher than that of the low-pressure oil way, the inlet of the first reversing valve is connected with the high-pressure oil way, the outlet of the first reversing valve is respectively connected with the rod cavity of the pressure cylinder, the rodless cavity of the pressure cylinder and the oil return tank, the first reversing valve can enable the high-pressure oil way to be communicated with the rod cavity of the pressure cylinder and the oil return tank to be communicated with the rodless cavity of the pressure cylinder or the high-pressure oil way to be communicated with the rodless cavity of the pressure cylinder and the oil return tank to be communicated with the rod cavity of the pressure cylinder, the low-pressure oil way is connected with the rodless cavity of the pressure cylinder through a second oil way, and a first switch valve is arranged on the second oil way, the first switch valve is used for controlling the low-pressure oil way to be communicated with and disconnected from a rodless cavity of the pressure cylinder, the rodless cavity of the pressure cylinder is connected with the oil return tank through a third oil way, a first two-way valve is arranged on the third oil way, a second switch valve is further arranged on a pipeline connected with the low-pressure oil way, the second switch valve is used for controlling the low-pressure oil way to be communicated with and disconnected from the rodless cavity of the pressure cylinder, and the first two-way valve can enable oil to flow into or flow out in a one-way mode from the rodless cavity of the pressure cylinder.
Preferably, an oil pipe between the inlet of the first reversing valve and the high-pressure oil path is further provided with a first check valve, and the first check valve only allows hydraulic oil in the high-pressure oil path to flow from the high-pressure oil path to the inlet of the first reversing valve.
Preferably, a second two-way valve is further disposed on an oil pipe between the first direction changing valve and the rod chamber of the hydraulic cylinder, the second two-way valve enables one-way flow of oil into or out of the rod chamber of the hydraulic cylinder, and a shuttle valve is further disposed on the second two-way valve and is used for controlling reverse flow of the second two-way valve.
Preferably, the shearing and feeding device further comprises a shearing and feeding cylinder and a second reversing valve, wherein an inlet of the second reversing valve is connected with the low-pressure oil way, an outlet of the second reversing valve is respectively connected with a rod cavity, a rodless cavity and the oil return box of the shearing and feeding cylinder, the second reversing valve can enable the low-pressure oil way to be communicated with the rod cavity of the shearing and feeding cylinder and enable the oil return box to be communicated with the rodless cavity of the shearing and feeding cylinder or enable the low-pressure oil way to be communicated with the rodless cavity of the shearing and feeding cylinder and enable the oil return box to be communicated with the rod cavity of the shearing and feeding cylinder.
Preferably, an oil pipe between the inlet of the second reversing valve and the low-pressure oil path is further provided with a second check valve, and the second check valve only allows hydraulic oil in the low-pressure oil path to flow from the low-pressure oil path to the inlet of the second reversing valve.
Preferably, the second check valve is connected and communicated with the oil return tank, and an overflow valve is further arranged on an oil pipe between the second check valve and the oil return tank and used for stabilizing the pressure of oil flowing into the second check valve from the low-pressure oil path.
Preferably, the hydraulic jack further comprises at least one ejection cylinder and a third reversing valve, an inlet of the third reversing valve is connected with the low-pressure oil path, an outlet of the third reversing valve is respectively connected with the rod cavity, the rodless cavity and the oil return tank of each ejection cylinder, and the third reversing valve can enable the low-pressure oil path to be communicated with the rod cavity of each ejection cylinder and enable the oil return tank to be communicated with the rodless cavity of each ejection cylinder or enable the low-pressure oil path to be communicated with the rodless cavity of each ejection cylinder and enable the oil return tank to be communicated with the rod cavity of each ejection cylinder.
Preferably, the oil outlet pipe of the low-pressure oil way is further provided with a pressure sensor and a pressure gauge, the pressure sensor is used for detecting oil pressure in the low-pressure oil way, and the pressure sensor is electrically connected with the pressure gauge.
Preferably, the first reversing valve is a three-position four-way solenoid valve.
Preferably, the first two-way valve is a pilot operated one-way valve.
Compared with the prior art, the utility model has the following technical effects:
according to the hydraulic control system of the heading machine, when a pressure cylinder needs a fast-forward process, hydraulic oil is filled into a rodless cavity through two low-pressure oil ways to perform fast oil supplement, when a pressure cylinder needs a pressurization process, one low-pressure oil way and one high-pressure oil way are adopted to fill the rodless cavity with hydraulic oil, so that the pressure cylinder is stably pressurized and stably operated, when the pressure cylinder needs a fast-backward process, the high-pressure oil way is filled into a rod cavity, and two ways of oil returns are performed in the rodless cavity, so that the fast retraction of the pressure cylinder is ensured.
Furthermore, the first check valve can ensure that high-pressure oil of the high-pressure oil way cannot flow backwards, so that the hydraulic pressure can be stably pushed out of the pressure cylinder.
Furthermore, a second two-way valve and a shuttle valve are arranged on an oil path of a rod cavity of the pressure cylinder, and the shuttle valve can control the opening of the second two-way valve to enable oil in the rod cavity to flow out, so that the stable rod returning action of the pressure cylinder can be ensured, and the safety of the device is ensured.
Furthermore, a shearing and feeding cylinder is further arranged, and the working state of the shearing and feeding cylinder is controlled through a second reversing valve of the shearing and feeding cylinder, so that the working requirements of a plurality of cylinder stations are met.
Furthermore, the second one-way valve can ensure that hydraulic oil entering the oil cylinder cannot flow out of the cavity, and further ensure that the cylinder rod can stably extend out or retract.
Furthermore, the overflow valve can ensure that the pressure in the pipeline is not too high to cause the pipeline to be damaged, and the safety of the pipeline is ensured.
Further, the system also comprises a plurality of ejection cylinders, and the arrangement of the ejection cylinders enables the system to support the use requirements of different procedures.
Furthermore, the pressure sensor and the pressure gauge arranged on the oil outlet pipe of the low-pressure oil way can prompt the oil pressure in the oil way, so that an operator can guarantee that the oil pressure is in a safety range.
Furthermore, the first reversing valve adopts a common three-position four-way electromagnetic valve, and the components of the three-position four-way electromagnetic valve are common and easy to obtain.
Furthermore, the first two-way valve adopts a hydraulic control one-way valve, so that the one-way flow of oil is ensured more stably.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a hydraulic schematic diagram of a hydraulic control system of a heading machine provided by the utility model.
In the figure: 100-a heading machine hydraulic control system; 1-pressing a cylinder; 11-a first direction valve; 12-a first on-off valve; 13-a first two-way valve; 14-a second on-off valve; 15-a first one-way valve; 16-a second two-way valve; 17-a shuttle valve; 2-an oil supply system; 21-low pressure oil circuit; 22-high pressure oil circuit; 3-an oil return tank; 4-shearing a feeding cylinder; 41-a second reversing valve; 42-a second one-way valve; 43-relief valve; 5, ejecting the cylinder; 51-a third directional valve; 6-a pressure sensor; 7-pressure gauge.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model aims to provide a hydraulic control system of a heading machine, which aims to solve the problems in the prior art, enable a pressure cylinder to be capable of fast-forwarding, stably working and fast-returning and ensure the working efficiency.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The utility model provides a hydraulic control system 100 of a heading machine, which comprises a pressure cylinder 1, a first reversing valve 11, an oil supply system 2 and an oil return tank 3, wherein the pressure cylinder 1 is provided with a rod cavity and a rodless cavity, the oil supply system 2 is provided with a low-pressure oil way 21 and a high-pressure oil way 22, the oil pressure of the high-pressure oil way 22 is higher than that of the low-pressure oil way 21, the inlet of the first reversing valve 11 is connected with the high-pressure oil way 22, the outlet of the first reversing valve 11 is respectively connected with the rod cavity of the pressure cylinder 1, the rodless cavity of the pressure cylinder 1 and the oil return tank 3, the first reversing valve 11 can enable the high-pressure oil way 22 to be communicated with the rod cavity of the pressure cylinder 1 and enable the oil return tank 3 to be communicated with the rod cavity of the pressure cylinder 1 or the high-pressure oil way 22 to be communicated with the rodless cavity of the pressure cylinder 1 and enable the oil return tank 3 to be communicated with the rod cavity of the pressure cylinder 1, the low-pressure oil way 21 is connected with the rodless cavity of the pressure cylinder 1 through a second oil way, a first switch valve 12 is arranged on the second oil way, and the first switch valve 12 is used for controlling the communication and disconnection of the low-pressure oil way 21 with the rodless cavity of the pressure cylinder 1, the rodless cavity of the pressure cylinder 1 is connected with the oil return tank 3 through a third oil path, a first two-way valve 13 is arranged on the third oil path, a second switch valve 14 is further arranged on a pipeline connecting the first two-way valve 13 with the low-pressure oil path 21, the second switch valve 14 is used for controlling the low-pressure oil path 21 to be communicated with or disconnected from the rodless cavity of the pressure cylinder 1, and the first two-way valve 13 can enable oil to flow into or out of the rodless cavity of the pressure cylinder 1 in a one-way mode.
When the pressure cylinder 1 needs a fast-forward process, the low-pressure oil circuit 21 fills hydraulic oil into the rodless cavity through two paths to perform fast oil supplement, specifically, the oil in the rod cavity flows back to the oil return tank 3 through the first reversing valve 11 at the moment to jointly form a fast-forward process of the pressure cylinder, and the piston of the pressure cylinder 1 stops moving after contacting a workpiece; when a pressure working procedure is required by a pressure cylinder 1, hydraulic oil is filled into the rodless cavity by adopting one low-pressure oil way 21 and one high-pressure oil way 22, so that the pressure cylinder 1 is stably pressurized and stably works, at the moment, the oil in the rod cavity flows back into the oil return tank 3 through the first reversing valve 11, a pressure cylinder co-working pressure working procedure is formed together, and the shearing of a workpiece is completed; when the pressure cylinder 1 needs a quick return process, the high-pressure oil way 22 is filled with the rod cavity and two oil returns without the rod cavity, so that the pressure cylinder 1 can return for two dogs to jointly form a quick return process, and the quick return of the pressure cylinder 1 is further ensured.
A first check valve 15 is further arranged on an oil pipe between the inlet of the first reversing valve 11 and the high-pressure oil path 22, and the first check valve 15 only allows the hydraulic oil in the high-pressure oil path 22 to flow from the high-pressure oil path 22 to the inlet of the first reversing valve 11. The first check valve 15 can ensure that the high-pressure oil in the high-pressure oil passage 22 does not flow backward, and the hydraulic pressure continues to stably push out the hydraulic cylinder 1.
A second two-way valve 16 is further arranged on an oil pipe between the first reversing valve 11 and the rod cavity of the hydraulic cylinder 1, specifically, the second two-way valve 16 is a pilot-controlled one-way valve, the second two-way valve 16 enables oil to flow into or out of the rod cavity of the hydraulic cylinder 1 in a one-way mode, a shuttle valve 17 is further arranged on the second two-way valve 16, and the shuttle valve 17 is used for controlling reverse flow of the second two-way valve 16. The second two-way valve 16 and the shuttle valve 17 are arranged on the oil path of the rod cavity of the pressure cylinder 1, and the shuttle valve 17 can control the opening of the second two-way valve 16 to enable the oil in the rod cavity to flow out, so that the stable rod returning action of the pressure cylinder 1 can be ensured, and the safety of the device is ensured.
The heading machine hydraulic control system 100 further comprises a shearing feeding cylinder 4 and a second reversing valve 41, specifically, the second reversing valve 41 adopts a three-position four-way valve, an inlet of the second reversing valve 41 is connected with the low-pressure oil way 21, an outlet of the second reversing valve 41 is respectively connected with a rod cavity, a rodless cavity and an oil return box 3 of the shearing feeding cylinder 4, and the second reversing valve 41 can enable the low-pressure oil way 21 to be communicated with the rod cavity of the shearing feeding cylinder 4 and enable the oil return box 3 to be communicated with the rodless cavity of the shearing feeding cylinder 4 or enable the low-pressure oil way 21 to be communicated with the rodless cavity of the shearing feeding cylinder 4 and enable the oil return box 3 to be communicated with the rod cavity of the shearing feeding cylinder 4. The shearing and feeding cylinder 4 is further arranged, the working state of the shearing and feeding cylinder 4 is controlled through the second reversing valve 41, so that the working requirements of a plurality of cylinder stations are met, specifically, oil in the low-pressure oil path 21 enters a rodless cavity of the shearing and feeding cylinder 4, and the oil in the rod cavity flows back to the oil return tank 3, so that a shearing and feeding process is formed together; when the oil liquid of the low-pressure oil circuit 21 enters the rod cavity of the shearing feeding cylinder 4, and the oil liquid of the rodless cavity flows back to the oil return tank 3, a quick return process of the shearing feeding cylinder is formed together.
A second check valve 42 is further provided on an oil line between the inlet of the second direction valve 41 and the low pressure oil passage 21, and the second check valve 42 allows only the hydraulic oil in the low pressure oil passage 21 to flow from the low pressure oil passage 21 to the inlet of the second direction valve 41. The second check valve 42 is arranged to ensure that hydraulic oil which has entered the oil cylinder cannot flow out of the cavity, thereby ensuring that the cylinder rod can stably extend or retract.
The second check valve 42 is connected and communicated with the oil return tank 3, and an overflow valve 43 is further arranged on an oil pipe between the second check valve 42 and the oil return tank 3, and the overflow valve 43 is used for stabilizing the pressure of oil flowing into the second check valve 42 from the low-pressure oil passage 21. The overflow valve 43 can ensure that the pressure in the pipeline is not too high to damage the pipeline, and ensure the safety of the pipeline. Specifically, the relief valve 43 can ensure that the pressure of the oil entering the second check valve 42 is not higher than the pressure value set on the relief valve 43.
The heading machine hydraulic control system 100 further comprises at least one ejection cylinder 5 and a third reversing valve 51, specifically, the number of the ejection cylinders 5 is 4, the ejection cylinders are symmetrically arranged, the third reversing valve 51 is a three-position four-way electromagnetic valve, an inlet of the third reversing valve 51 is connected with the low-pressure oil path 21, outlets of the third reversing valve 51 are respectively connected with the rod chamber, the rodless chamber and the oil return tank 3 of each ejection cylinder 5, and the third reversing valve 51 can enable the low-pressure oil path 21 to be communicated with the rod chamber of each ejection cylinder 5 and enable the oil return tank 3 to be communicated with the rodless chamber of each ejection cylinder 5 or enable the low-pressure oil path 21 to be communicated with the rodless chamber of each ejection cylinder 5 and enable the oil return tank 3 to be communicated with the rod chamber of each ejection cylinder 5. The system also comprises a plurality of ejection cylinders 5, the arrangement of the ejection cylinders 5 enables the system to support the use requirements of different processes, specifically, oil in a low-pressure oil path 21 enters a rodless cavity of each ejection cylinder 5, and simultaneously the oil in a rod cavity of each ejection cylinder 5 flows back to the oil return tank 3 to jointly form an ejection cylinder retraction process; when the oil liquid of the low-pressure oil path 21 enters the rod cavity of each ejection cylinder 5, the oil liquid in the rodless cavity of each ejection cylinder 5 flows back to the oil return tank 3, and an ejection process of the ejection cylinder is formed together.
Specifically, the heading machine hydraulic control system 100 includes seven processes, which are a shearing feeding cylinder feeding process, a jacking cylinder retracting process, a pressure cylinder fast-forwarding process, a shearing feeding cylinder fast-returning process, a pressure cylinder co-advancing and pressurizing process, a pressure cylinder returning process and a jacking cylinder ejecting process.
Still be provided with pressure sensor 6 and manometer 7 that are used for detecting the interior oil pressure of low pressure oil circuit 21 on the oil pipe of low pressure oil circuit 21, pressure sensor 6 is connected with manometer 7 electricity, and is concrete, and pressure sensor 6 is used for detecting pressure data, and manometer 7 is used for showing the pressure numerical value of 6 monitoring of pressure sensor, and according to oil circuit pressure monitoring demand, can rationally set up pressure sensor 6 and manometer 7 in different positions. The pressure sensor 6 and the pressure gauge 7 arranged on the oil outlet pipe of the low-pressure oil way 21 can prompt the oil pressure in the oil way, so that an operator can guarantee that the oil pressure is in a safety range.
The first directional valve 11 is a three-position four-way solenoid valve. The first reversing valve 11 is a common three-position four-way solenoid valve, and the components of the solenoid valve are common and easy to obtain.
The first two-way valve 13 is a pilot operated one-way valve. The first two-way valve 13 is a hydraulic control one-way valve, so that the one-way flow of oil is ensured more stably.
The principle and the implementation mode of the utility model are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.
Claims (10)
1. The utility model provides a heading machine hydraulic control system which characterized in that: the hydraulic cylinder is provided with a rod cavity and a rodless cavity, the oil supply system is provided with a low-pressure oil way and a high-pressure oil way, the oil pressure of the high-pressure oil way is higher than that of the low-pressure oil way, the inlet of the first reversing valve is connected with the high-pressure oil way, the outlet of the first reversing valve is respectively connected with the rod cavity of the hydraulic cylinder, the rodless cavity of the hydraulic cylinder and the oil return box, the first reversing valve can enable the high-pressure oil way to be communicated with the rod cavity of the hydraulic cylinder and enable the oil return box to be communicated with the rodless cavity of the hydraulic cylinder or enable the oil return box to be communicated with the rodless cavity of the hydraulic cylinder and enable the oil return box to be communicated with the rod cavity of the hydraulic cylinder, the low-pressure oil way is connected with the rodless cavity of the hydraulic cylinder through a second oil way, a first switch valve is arranged on the second switch valve and used for controlling the low-pressure oil way to be communicated with and disconnected with the rodless cavity of the hydraulic cylinder, the rodless cavity of the pressure cylinder is connected with the oil return box through a third oil path, a first two-way valve is arranged on the third oil path, a second switch valve is further arranged on a pipeline connected with the first two-way valve and the low-pressure oil path, the second switch valve is used for controlling the low-pressure oil path to be communicated with or disconnected from the rodless cavity of the pressure cylinder, and the first two-way valve can enable oil to flow into or out of the rodless cavity of the pressure cylinder in a one-way mode.
2. The heading machine hydraulic control system according to claim 1, characterized in that: and an oil pipe between the inlet of the first reversing valve and the high-pressure oil way is also provided with a first one-way valve, and the first one-way valve only allows hydraulic oil in the high-pressure oil way to flow from the high-pressure oil way to the inlet of the first reversing valve.
3. The heading machine hydraulic control system according to claim 1, characterized in that: and a second two-way valve is further arranged on an oil pipe between the first reversing valve and the rod cavity of the pressure cylinder, the second two-way valve can enable oil to flow into or out of the rod cavity of the pressure cylinder in a one-way mode, a shuttle valve is further arranged on the second two-way valve, and the shuttle valve is used for controlling the reverse circulation of the second two-way valve.
4. The heading machine hydraulic control system according to claim 1, characterized in that: the low-pressure oil way is communicated with the rod cavity of the shearing feeding cylinder by the second reversing valve, so that the oil return box is communicated with the rod cavity of the shearing feeding cylinder or communicated with the rod cavity of the shearing feeding cylinder by the low-pressure oil way, and the oil return box is communicated with the rod cavity of the shearing feeding cylinder by the second reversing valve.
5. The heading machine hydraulic control system according to claim 4, wherein: and a second one-way valve is further arranged on an oil pipe between the inlet of the second reversing valve and the low-pressure oil way, and only allows hydraulic oil in the low-pressure oil way to flow from the low-pressure oil way to the inlet of the second reversing valve.
6. The heading machine hydraulic control system according to claim 5, characterized in that: the second one-way valve is connected and communicated with the oil return tank, an overflow valve is further arranged on an oil pipe between the second one-way valve and the oil return tank, and the overflow valve is used for stabilizing the pressure of oil flowing into the second one-way valve from the low-pressure oil way.
7. The heading machine hydraulic control system according to claim 1, characterized in that: the low-pressure oil way is communicated with the rod cavity of each ejection cylinder and the oil return box, or the low-pressure oil way is communicated with the rodless cavity of each ejection cylinder and the oil return box.
8. The heading machine hydraulic control system according to claim 1, characterized in that: the oil outlet pipe of the low-pressure oil way is also provided with a pressure sensor and a pressure gauge, wherein the pressure sensor and the pressure gauge are used for detecting the oil pressure in the low-pressure oil way, and the pressure sensor is electrically connected with the pressure gauge.
9. The heading machine hydraulic control system according to claim 1, characterized in that: the first reversing valve is a three-position four-way electromagnetic valve.
10. The heading machine hydraulic control system according to claim 1, characterized in that: the first two-way valve is a hydraulic control one-way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122506512.3U CN216447215U (en) | 2021-10-18 | 2021-10-18 | Hydraulic control system of heading machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122506512.3U CN216447215U (en) | 2021-10-18 | 2021-10-18 | Hydraulic control system of heading machine |
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| Publication Number | Publication Date |
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| CN216447215U true CN216447215U (en) | 2022-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122506512.3U Active CN216447215U (en) | 2021-10-18 | 2021-10-18 | Hydraulic control system of heading machine |
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| CN (1) | CN216447215U (en) |
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2021
- 2021-10-18 CN CN202122506512.3U patent/CN216447215U/en active Active
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